Dental composition containing glass beads, process for production and use thereof

Abstract

The invention relates to a dental impression composition comprising a hardenable matrix and glass beads having a particle size (d50/μm) equal or below about 60 μm. The invention also relates to a method of producing this composition and its use.

The invention claimed is: 
     
       1. A dental impression composition comprising a hardenable matrix and glass beads having a particle size (d50/μm) equal to or below about 60 μm, and a tensile strength (according to DIN 53504), after hardening, of up to about 1 MPa, wherein the composition is characterized by the following parameter: a setting time within about 15 min after mixing at ambient conditions. 
     
     
       2. The dental composition of  claim 1 , wherein the glass beads are present in an amount of up to about 80 wt.-% with respect to the weight of the whole composition. 
     
     
       3. The dental composition of  claim 1 , wherein the composition is characterized by the following parameter:
 a consistency (according to ISO 4823) of 0, 1, 2 or 3. 
 
     
     
       4. The dental composition of  claim 1 , wherein in the composition, after curing, is characterized by an elongation at break (according to DIN 53504) of about 10 to about 300%. 
     
     
       5. The dental composition of  claim 1 , wherein the hardenable matrix comprises moieties selected from polyether, polyester, polyurethane and/or siloxane moieties or mixtures of two or more of these moieties. 
     
     
       6. The dental composition of  claim 1 , wherein the glass beads are characterized by hollow interiors. 
     
     
       7. The dental composition of  claim 1  further comprising a filler being different from the glass beads. 
     
     
       8. A dental impression composition comprising:
 at least one polydimethylsiloxane with at least 2 aliphatically unsaturated groups as component (A), 
 at least one SiH compound with ≧2 SiH-groups per molecule, as component (B), 
 a catalyst as component (C) being able to catalyse the reaction between components (A) and (B), 
 glass beads as component (D) particle size (d50/μm) equal or below about 60 μm, 
 optionally at least one non-reactive polydimethylsiloxane as component (E), 
 optionally fillers as component (F) being different from the glass beads, 
 optionally surfactants or wetting agents as component (G), 
 optionally further additives as component (H) selected from the group consisting retarders, rheology modifiers, inhibitors, pigments, plastizers, dyes, pigments, odorous substances, flavourings, hydrogen scavenger alone or in admixture 
 wherein the composition has, after hardening, a tensile strength (according to DIN 53504) of up to about 1 MPa, and 
 wherein the composition is characterized by the following parameter: a setting time within about 15 min after mixing at ambient conditions. 
 
     
     
       9. The dental composition of  claim 8 , wherein the components are present in the following amounts:
 Component (A): from about 20 wt.-% to about 60 wt.-%, 
 Component (B): from about 0.1 wt.-% to about 15 wt.-%, 
 Component (C): from about 0.001 wt.-% to about 0.1 wt.-%, 
 Component (D): from about 0.5 wt.-% to about 70 wt.-%, 
 Component (E): from about 0 wt.-% to about 30 wt.-%, 
 Component (F): from about 0 wt.-% to about 75 wt.-%, 
 Component (G): from about 0 wt.-% to about 10 wt.-%, 
 Component (H): from about 0 wt.-% to about 10 wt.-%, 
 
       wt.-% with respect to the whole composition. 
     
     
       10. A kit of parts comprising a base paste and a catalyst paste separated from each other before use, wherein the base paste comprises components (A) and (B) and the catalyst paste comprises component (C) or (C) and (A), and wherein component (D) and the other optional components (E), (F), (G) and (H) can be present either in the base paste or the catalyst paste or the base paste and the catalyst paste, wherein components (A) to (H) are as described in any of  claim 8  or  9 ,
 wherein the kit is characterized by the following parameter: a setting time within about 15 min after mixing the base paste and the catalyst paste at ambient conditions, and 
 wherein the mixed composition has, after hardening, a tensile strength (according to DIN 53504) of up to about 1 MPa. 
 
     
     
       11. A method of producing a dental composition according to  claim 8  comprising the step of combining glass beads having a particle size (d50/μm) equal to or below about 60 μm with a composition comprising components (A), (B), (C), wherein components (A), (B) and (C) are as described in any of  claim 8  or  9 . 
     
     
       12. A method of preparing a dental impression composition according to  claim 1  comprising combining glass beads with a hardenable matrix, wherein the glass beads have a particle size (d50/μm) equal or below about 60 μm and wherein the composition, after hardening, has a tensile strength (according to DIN 53504) of up to about 1 MPa. 
     
     
       13. A method of taking a dental impression comprising hardening a dental impression composition as described in  claim 1 . 
     
     
       14. A method of taking a dental impression comprising hardening a composition comprising an alginate containing dental impression composition having the alginate substituted with the dental impression composition as described in any of  claim 1  or  8 . 
     
     
       15. A method of taking a dental impression comprising hardening a dental impression composition as described in  claim 8 . 
     
     
       16. The dental composition of  claim 4 , wherein in the composition, after curing, is characterized by an elongation at break (according to DIN 53504) of about 15 to about 200%. 
     
     
       17. The dental composition of  claim 1 , wherein in the composition, after curing, is characterized by a shore A hardness (according to DIN 53505) of about 10 to about 75. 
     
     
       18. The dental composition of  claim 17 , wherein in the composition, after curing, is characterized by a shore A hardness (according to DIN 53505) of about 30 to about 50. 
     
     
       19. The dental composition of  claim 1 , wherein the composition, after curing, is characterized by a density (according to the Archimedes method) of about 0.4 to about 1.8 g/ml. 
     
     
       20. The dental composition of  claim 1 , wherein the composition is characterized a consistency (according to ISO 4823) of 2. 
     
     
       21. The dental composition of  claim 1 , wherein the glass beads have a particle size (d50/μm) equal to or below about 50 μm. 
     
     
       22. The dental composition of  claim 1 , wherein the glass beads are characterized by a density from about 0.10 to about 0.70 g/ml. 
     
     
       23. The dental composition of  claim 1 , wherein the glass beads are characterized by an impact strength greater than or equal to about 1.7 MPa. 
     
     
       24. The dental composition of  claim 8 , wherein in the composition, after curing, is characterized by an elongation at break (according to DIN 53504) of about 10 to about 300%. 
     
     
       25. The dental composition of  claim 24 , wherein in the composition, after curing, is characterized by an elongation at break (according to DIN 53504) of about 15 to about 200%. 
     
     
       26. The dental composition of  claim 8 , wherein in the composition, after curing, is characterized by a shore A hardness (according to DIN 53505) of about 10 to about 75. 
     
     
       27. The dental composition of  claim 26 , wherein in the composition, after curing, is characterized by a shore A hardness (according to DIN 53505) of about 30 to about 50. 
     
     
       28. The dental composition of  claim 8 , wherein the composition, after curing, is characterized by a density (according to the Archimedes method) of about 0.4 to about 1.8 g/ml. 
     
     
       29. The dental composition of  claim 8 , wherein the composition is characterized a consistency (according to ISO 4823) of 2. 
     
     
       30. The dental composition of  claim 8 , wherein the glass beads have a particle size (d50/μm) equal to or below about 50 μm. 
     
     
       31. The dental composition of  claim 8 , wherein the glass beads are characterized by hollow interiors. 
     
     
       32. The dental composition of  claim 8 , wherein the glass beads are characterized by a density from about 0.10 to about 0.70 g/ml. 
     
     
       33. The dental composition of  claim 8 , wherein the glass beads are characterized by an impact strength greater than or equal to about 1.7 MPa. 
     
     
       34. The method of  claim 13 , wherein the hardened dental impression composition is in the form of a mould and the mould is filled with a crown or bridge material. 
     
     
       35. The method of  claim 15 , wherein the hardened dental impression composition is in the form of a mould and the mould is filled with a crown or bridge material.